无乙肝症状的“健康人群”中前S_2蛋白及抗前S_2的血清学调查

采用国产单克隆抗体酶标试剂盒(McAb—ELISA)对广东某地区无乙肝症状的298人作了血清前S_2蛋白及抗前S_2检测,同时检测各项乙型肝炎病毒血清学标志(HBVM)及肝功能。全部检测对象肝功能正常。前S_2阳性率7.72％。抗前S_2阳性率5.70％。前者与HBsAg及其它乙肝病毒复制标志(HBcAg、PHSA-R、HBcAg、抗-HBcIgM及HBVDNA)有平行关系,后者则与抗HBs有平行关系。结果提示前S_2可作为一项敏感的HBV复制及传染性的指标,抗前S_2是一项乙肝感染的恢复标志,二者有重要的流行病学与临床意义,检测证实人群中存在相当数量的HBV携带者和隐性感染者。     

Ovicidal activity of two fungal pathogens （Hyphomycetes）against Tetranychus cinnabarinus （Acarina：Tetranichidae）

The carmine spider mite, Tetranychus cinna-barinus, is an economically important pest that devastates varieties of crops worldwide and develops significant resistance to common chemical pesticides, most of which lack ovicidal activity. In the present study, two isolates of entomopathogenic fungi, Beuaveria bassiana SG8702 and Pae-cilomyces fumosoroseus Pfrl53, were bioassayed against T. cinnabarinus eggs at 25 ℃ under a photophase of 12 : 12 (L:D). Infected eggs on Vicia faba var. minor leaves failed to hatch due to distortion and shrinkage and had fungal outgrowths when maintained under moist conditions. Sprays of B. bassiana conidia to T. cinnabarinus eggs (on leaves) at the concentrations of 58, 298 and 1306 conidia/mm2 (3 replicates per concentration and 35-65 fresh mite eggs per replicate) resulted in corrected egg mortalities of 20.4±4.2%, 36.0±7.6% and 64.6±12.5% (F=43.14, P <0.01), respectively; sprays of P. fumosoroseus at 129, 402 and 2328 conidia/mm2 caused egg mortalities of 16.1±11.1%,     

细胞凋亡与病毒感染

病毒感染细胞后通过其自身基因的表达或激活宿主细胞凋亡相关基因,启动或抑制细胞凋亡.研究病毒与细胞的相互关系,有助于深入理解病毒的致病机理,为病毒性疾病的预防、治疗和诊断提供相应对策.     

353例孕妇TORCH感染与不良流产的关系

目的:探讨TORCH感染与不良流产的关系。方法:对353例孕妇用酶联免疫吸附试验测RV-IgM,TOX-IgM,CMV-IgM,HSV-IgM。结果:353例中,RV-IgM阳性者18例,阳性率为5.10%,TOX-IgM阳性者9例,阳性率为2.55%,CMV-IgM阳性者7例,阳性率为1.98%,HSV-IgM阳性者5例,阳性率为1.42%。结论:不良流产与TORCH感染有关。     

医院环境下的耐抗生素细菌流行病模型分析

讨论了由G.W ebb等人建立的医院环境下耐抗生素的细菌流行病模型,得到了该模型的两个基本再生数的表达式、边界平衡点和正平衡点的存在性条件以及边界平衡点的稳定性条件.     

"鸭传染性肿头症"病毒对雏鸭致病性和卵黄抗体研究

对从病鸭群中分离的鸭“传染性肿头症”病毒对雏鸭致病性进行研究,证明其对雏鸭致病力强,致死率为100％,人工感染的潜伏期为3－6d。人工感雏鸭的症状和病理变化与自然发病病例相类似。从感染途径看,注射、消化道、呼吸道均能感染发病。用商品蛋鸡生产的鸡抗“鸭传染性肿头症”高免卵黄抗体,有较好的预防效果,为本病的特异性防治提供了有效的手段。     

Comparison of infection frequencies in fetus by maternal ascitic cancer and leukemia cells

It was demonstrated that maternal Ehrlich cells could infect fetus in a mouse model, which is another kind of the cancer cells inducing cancer cell infection between mother and fetus besides leukemia L615 cells reported previously by the authors. Among the fetus in a pregnancy only a few of them might be infected by the maternal cancer cells. The early and medial periods of pregnancy are the dangerious periods for the cancer infection. The infection frequencies for leukemia L615 cells and Ehrlich cells are 100% and 35%, respectively; but in the late period of pregnancy they are 4.5% and zero for leukemia L615 and Ehrlich cells, respectively. This indicates that the infection frequency for leukemia L615 cells is much higher than Ehrlich cells. The infection might be caused by infiltration or invasion of the cancer cells.     

杉木炭疽病菌(Glomerella cingulata)潜伏侵染的研究

杉木针叶上炭疽病菌(Glomerella cingulata)的潜伏侵染研究结果表明:(1)杉木不同冠位、不同枝段和不同叶片部位的潜伏侵染率不同;(2)当年针叶5月中旬开始受侵,8月末达侵染高峰,当半个月平均气温低于10℃时不发生侵染,(3)针叶潜伏侵染率随杉木林地位级升高而增加,发病程度随地位级升高而降低,(4)病害症状于4～6月表现在先年枝梢的顶端,病害程度同针叶潜伏侵染率无关;(5)针叶中还原糖含量高似乎是影响病菌打破潜伏侵染的因素。     

鲁氏耶尔森氏菌及鱼类相应感染症（综述）

记述了鲁氏耶尔森氏菌的分类、主要生物学特性及相直鱼类感染症的特点等内容，同时提出了当前在这些方面的一些主要研究重点。